Hollywood Casino Perryville was the first slots casino to open in Maryland after a referendum was passed in 2008. The Perryville casino is located in Cecil County, just across the Susquehanna River from Harford County and the city of Havre de Grace. It's less than a mile off of I-95 at the Route 222 Perryville exit. They have 1,500 slot machines and offer the "Club Hollywood" loyalty program.